How does alarm monitoring work, step by step?

A detector triggers the alarm panel, the panel sends a coded signal over a fixed line, mobile network or broadband to an Alarm Receiving Centre, an operator identifies the property and activation type, and then follows your agreed escalation list — contacting you and your keyholders, and requesting police attendance if the system qualifies for it.

In sequence: a detector activates and reports to the control panel. The panel decides whether this is a reportable event, and passes it to the signalling device. The signalling device transmits it to the ARC over its configured path or paths.

At the ARC, the signal arrives tagged with an account number, so the operator sees which property it is, which zone activated, and what response has been agreed. Many activations are resolved at this stage — a genuine user who has set the alarm off and can confirm their identity with a password, for example.

If it is not resolved, the operator escalates. For a keyholder-response contract that means calling your nominated contacts or dispatching a response company. For a police-response contract, and where the activation meets the confirmation requirement, the operator passes it to the police using the property's Unique Reference Number.

The whole chain is only as good as its weakest link, which is usually the information held on file. Out-of-date keyholder phone numbers are the single most common reason a technically perfect monitoring setup produces no useful response.